Magnetic Vortex Core Dynamics in a Ferromagnetic Dot

Details Magnetic Vortex Core Dynamics in a Ferromagnetic Dot Magnetic Vortex Core Dynamics in a Ferromagnetic Dot

2005-10-21

arxiv.org/abs/cond-mat/0510595v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

18 pages including 4 figures

Scientific paper

10.1103/PhysRevLett.96.067205

We report direct imaging by means of x-ray photoemission electron microscopy of the dynamics of magnetic vortices confined in micron-size circular Permalloy dots that are 30 nm thick. The vortex core positions oscillate on a 10-ns timescale in a self-induced magnetostatic potential well after the in-plane magnetic field is turned off. The measured oscillation frequencies as a function of the aspect ratio (thickness/radius) of the dots are in agreement with theoretical calculations presented for the same geometry.

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